#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>

int main()
{
	int a = 0;
	int b = 0;
	scanf("%d %d", &a, &b);
again:
	printf("%d\n", a + b);
	if (scanf("%d %d", &a, &b) != EOF)
	{
		printf("xxxxxx\n");
		goto again;
	}
	return 0;
}

